王孟斋, 谢宏, 白洋,等.贵州铜仁磷块岩型铀矿中有机质与P-U成矿关系探讨[J].河南理工大学学报（自然科学版）,2023,42(4):64-75.

WANG M Z, XIE H, BAI Y,et al.Investigation of the relationship between organic matter content and P-U mineralization in the uranium-bearing phosphorite in Tongren，Guizhou[J].Journal of Henan Polytechnic University(Natural Science) ,2023,42(4):64-75.

贵州铜仁磷块岩型铀矿中有机质与P-U成矿关系探讨

王孟斋1,2, 谢宏1,2, 白洋1,2, 卢正浩1,2

1.贵州大学 资源与环境工程学院，贵州 贵阳  550025；2.贵州大学 喀斯特地质资源与环境教育部重点实验室，贵州 贵阳  550025

摘要: 贵州铜仁磷块岩型铀矿富含有机质，为探究有机质与P-U成矿关系，开展岩/矿石显微特征与地球化学测试研究。结果表明：有机质呈浸染状分布于胶磷矿中，与胶磷矿关系密切；矿石有机质质量分数较高，TOC均值为0.84%，与w(P2O5),w(U)均成一定的正相关关系；TOC/w(N)较低，w(Cr)/w(Zr)较高，指示矿石有机质与P,U来源相同，均以内源为主；高w(U)/w(Th)指示P-U成矿方式为热水沉积；低w(Th)/w(U)、高δw(U)和高w(V)/w(V+Ni)均指示磷块岩型铀矿形成于缺氧-硫化的还原环境。P-U成矿过程中，与P,U同源的有机质主要以吸附、生命组成和生成铀酰络合物等方式参与成矿物质的迁移活化，并通过释放还原性气体、形成腐殖酸和酸性铀酰络合物改变P-U成矿环境，促使P-U富集成矿。

关键词:有机质;成矿关系;磷块岩型铀矿;贵州铜仁

doi:10.16186/j.cnki.1673-9787.2021080104

基金项目:国家自然科学基金资助项目（42062009，41662008）；贵州省自然科学基金资助项目（黔科合基础［2020］1Y158）；贵州大学引进人才科研项目（贵大人基合字［2015］第37号）

收稿日期:2021/08/28

修回日期:2022/02/14

出版日期:2023/07/25

Investigation of the relationship between organic matter content and P-U mineralization in the uranium-bearing phosphorite in Tongren，Guizhou

WANG Mengzhai1,2, XIE Hong1,2, BAI Yang1,2, LU Zhenghao1,2

1.College of Resources and Environmental Engineering，Guizhou University，Guiyang  550025，Guizhou，China；2.Key Laboratory of Karst Geological Resources and Environment of Ministry of Education，Guizhou University，Guiyang  550025，Guizhou，China

Abstract: The uranium-bearing phosphorite in Tongren,Guizhou is rich in organic matter. In order to explore the mineralization relationship between organic matter and P-U,microscopic characteristics of rock/ore and geochemical studies were carried out. The results showed that the organic matter was distributed in a leached form within the collophanite;The total organic matter content(TOC) in the ore was high,with an average value of 0. 84%. TOC exhibited a positive correlation with P₂O₅ and U contents. Moreover,low TOC/w(N) and high w(Cr)/w(Zr) ratios indicated that the organic matter in the ore and P-U were both of endogenous origin and high w(U)/w(Th) ratios implied that P-U might have enriched in hot waters,while low w(Th)/w(U) ratios,high δU values,and high w(V)/w(V+Ni) ratios indicated that the uranium-bearing phosphorite might have been formed in a strong reduction environment. During P-U mineralization,organic matter actively participated in the migration and activation of mineralized material mainly by adsorption,life metabolism,and generation of uranyl complexes. These processes changed the P-U mineralized environment by releasing reductive gas,forming humic acid and acidic uranyl complexes,which in turn contributed to P-U enrichment and mineralization.

Key words:organic matter;mineralization relationship;uranium-bearing phosphorite;Guizhou Tongren

贵州铜仁磷块岩型铀矿中有机质与P-U成矿关系探讨_王孟斋.pdf